RIBLET 



1272 



RIDGE 



Riblet (rib'-let) [ME., rib, rib]. Any pleurapophysis 

 not developed into a rib and not destined to be so de- 

 veloped ; a costal process of a vertebra. 



Rice (ris). See Oryza. R.-seed Bodies, peculiar 

 small, white bodies resembling grains of rice, found 

 in the so-called ganglia occurring on tendons. R.- 

 water Evacuations. See Oryza. 



Richard's Styptic Collodion. A solution of tannin 

 in collodion. 



Richardson's Bellows. An instrument for injecting 

 vapors into the middle ear. R.'s Mixture. See 

 Anesthetic. R.'s Neutral Blue Fluid, a fluid for in- 

 jecting tissues. Dissolve 0.648 gm. of ferrous sulphate 

 in 15 c.c. of glycerin ; and 2.07 gms. of potassium ferro- 

 cyanid in a liter of water, to which 15 c.c. of glycerin 

 have been added. Mix the two solutions gradually ; 

 then add 30 c.c. of alcohol and 1 20 c.c. of water. 

 R.'s Test. See Death, Signs of. 



Richet's Bandage. See Bandage. 



Richter's Collyrium. A mixture of rose-water and the 

 white of egg beaten to a froth. R.'s Hernia, 

 Parietal Enterocele, Partial Enterocele, Littrfs Hernia. 

 Strangulated enterocele in which only part of the cir- 

 cumference of the gut is constricted. See Diseases^ 

 Table of. 



Ricin {ri f -sin) [ricinus, a genus of the eufihorbiacece']. 

 The toxalbumin of the castor-oil bean ; a vegetable 

 albuminoid employed in the study of immunity. A 

 dose of j- 1 ^ gr. by the skin, or T 9 ^ gr. by the stomach 

 is toxic. It induces multiple hemorrhages of the 

 intestines and stomach, and appears to break down 

 the blood-corpuscles. Unof. 



Ricinelaidic (ris-in-el-a-id'-ik) [ricinus, castor-oil]. 

 Derived from castor-oil. R. Acid, an acid derived 

 from and isomeric with ricinoleic acid. 



Ricinic (ris-in'-ik) [ricinus, castor-oil]. Pertaining to 

 or having the properties of castor-beans or castor-oil. 

 Also applied to an acid derived from castor-oil. See 

 Ricinus. 



Ricinine [ri f -sin-in) [ricinus, castor-oil]. A crystalline 

 substance obtained from castor-oil. 



Ricinoleic Acid {ri-sin-o-le' '-ik). See Acid. 



Ricinus {ris f -in-us) [ L. ]. A genus of apetalous 

 euphorbiaceous plants. R. communis, the only 

 species is the well-known castor-oil plant, indige- 

 nous in America and Asia. The height is from 4 to 

 14 feet ; the leaves are alternate, peltate, palmately 

 seven-lobed or nine-lobed ; the flowers are monecious 

 and apetalous. The fruit is a grooved, rather triangular 

 tricoccous capsule, generally spinescent, with a single 

 oval or elliptic seed enclosed in each cell. The embryo 

 has foliaceous, heart-shaped cotyledons, is straight, 

 white, and imbedded in an oily albumin, having a 

 bland and slightly acrid taste. The seeds are chiefly 

 used in the manufacture of oleum ricini, castor-oil. 

 They are first crushed and freed from their cover- 

 ings, then kiln-dried and subjected to powerful 

 pressure. The oil is heated with water to remove 

 albuminous matters. The yield is 38 to 45 per cent., 

 by cold pressure 25 to 30 per cent. The oil prepared 

 by the latter method requires no further purification. 

 It is viscid, nearly transparent, pale greenish-yellow or 

 almost colorless. The specific gravity varies between 

 .950 and .960. The oil is partly soluble in petroleum 

 benzine, but is more soluble in absolute alcohol, 

 ether, and glacial acetic acid in all proportions. 

 When fresh, it has a neutral reaction to test- 

 paper, and is composed of several fats. The solid 

 fatty acid is related to palmitic acid, the liquid one 

 is ricinoleic acid. The acrid principle to which its 

 purgative properties are due has not been isolated. 

 Tuson claimed, in 1864, to have discovered an alka- 



loid, ricinin. The oil is used medicinally to over- 

 come constipation or to cure diarrhea due to the 

 presence of irritating substances. The dose for an 

 adult is from half an ounce to an ounce. R., Olei, 

 Mist. (B.P.), castor-oil, oil of lemon, oil of cloves, 

 potash, syrup, orange-flower water. Dose g ss— ij. 



Rickets {rik'-ets) [pn^ig, spine]. The common name 

 for Rachitis ; it is a constitutional disease of child- 

 hood, characterized by increased cell-growth of 

 the bones, with deficiency of earthy matter, resulting 

 in deformities, and with abnormal changes in the 

 spleen and liver. See Rachitis. 



Rickety (rik'-et-e) ['p&xiQ, spine]. Affected with, or 

 distorted by, rickets. R. Rosary, the beaded con- 

 dition of the ribs in rickets. See Rachitis. 



Rictal (rik'-tal) [ringi, to gape]. Pertaining or re- 

 lating to rictus. 



Rictus {rik'-tus) [L., from ringi, to gape]. A fissure 

 or cleft; a gaping, as of the mouth; the gape of a 

 bird. See Risus sardonicus. R. lupinus, cleftl 

 palate. 



Rider {ri'-der) [ME., ridere, a rider]. One 

 rides, especially one who rides on horseback. R.s 

 Bone, an osseous formation in the adductor muscle 

 of the leg, from long-continued pressure of th 

 against the saddle. See Exercise- boms. R.s 

 Bursa, an enlarged bursa, produced in the same *&) 

 as the riders' bone. R. Garbage - furnace, 

 form of furnace with two chambers, the foi 

 of which is the combustion-chamber in which th«j 

 garbage to be destroyed is placed, and the rear or, 

 the receiving -tank. 



Ridge (rij) [ME., rigge, the back of a man or beast] I 

 An extended elevation or crest. Rs., Bicipital, th 

 borders of the bicipital groove of the humerus. Rs 

 Condylar, the ridges ascending from the condy 

 the humerus. Rs., Dorsal. See./?.?., Medullary. R 

 Genital, the germ-ridge in front of and internal t 

 the Wolffian body, from which the internal re] r 

 tive organs are developed. R., Gluteal, the 

 rior intertrochanteric line. R., Interosseous 

 fibula), the ridge on the fibula which gives attachmei 

 to the interosseous membrane. R., Intervertebra 

 a crest on the vertebral end of a rib dividing the a 

 ticular surface into two portions. R., Lambdoida 

 thelambdoid crest. Rs., Lateral {of the blast,. 

 two ridges on the posterior end of the embr 

 shield that coalesce and close the primitive gi 

 R., Maxillary, dental crest ; a ridge of va 

 fibrous tissue along the alveolar processes of th( 

 illary bones of the fetus. Rs., Medullary, the lam 

 nse dorsales, or longitudinal elevations of the epiblas 

 which coalesce and close in the medullary or 1 

 tube. R., Mylo-hyoid, the ridge on the inner su 

 face of the inferior maxilla for the attachment 

 mylo-hyoid muscle. R., Neural, neural en- 

 ridge of epiblastic cells on the superior margin 

 medullary groove, from which the dorsal nen 

 the embryo are developed. Rs., Occipital, tin 

 rior and inferior curved lines of the occipital I 

 Rs., Palatine, one longitudinal and several 1 

 corrugations of the mucosa of the haul palate. P 

 Parietal, the ridge on the parietal bone ; 

 tinuation of the temporal ridge. Rs., Pectoral, t 

 bicipital ridges of the humerus. R., Pterotic. 

 ridge on the upper and external portion of the audi!' 1 

 capsule. R., Pterygoid, the infra-temporal 

 ridge on the external surface of the greater wing 

 sphenoid bone. Rs. of the Skin, the delicate 

 of the skin which intersect at various ang 

 correspond to the rows of papilla? of the corium. 1 

 Superciliary, the arched ridge of the frontal 



